<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

<style>
 *{
          margin: 0;
          padding: 0;
    }
.page{
          height: 200px;
          display: table;
          table-layout: fixed;
}
.page >div{
             display: table-cell;
}
.left,.right{
            width: 200px;
            height: 200px;
            background-color: aqua;
        
}
.content{
          width: 100%;
          height: 200px;
          background-color: brown;
}    
</style>
</head>
<body>
     <div class="page">
        <div class="left"></div>
        <div class="content"></div>
        <div class="right"></div>
     </div>
</body>
</html>